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The majority (IMO) has the Volant Intake and the Magnaflow exhaust. I currently have the Volant and like it (also considered the TrueFlow XDI) but I do not have the magnaflow. I would like to, however I'm only going to change out the muffler with a magnaflow.
Now, with all that said there may be another suggested setup if you plan on supercharging later on. Just my .02